Detex Watchclock Station

Back in the day, watchmen carried 5-pound clocks in a leather case, and their rounds took them by a series of stations containing a numbered key, which had to be inserted into the clock and turned to record a time on a strip of paper in the clock.  The Detex Corporation was one of the largest manufacturers of such systems.  Note that even the screws that secured the station to a wall were covered by a seal, presumably to make it impossible for a guard to remove them and carry them back to some central location where he could remain until the end of his shift before going around and replacing them.

http://www.icollector.com/VINTAGE-DETEX-NEWMAN-WATCH-CLOCK-W-KEY-LEATHER-C_i9932873